Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef774f8fa502505d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-28 04:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f875ba0f47ee3e87ec6df4244cd2ad0 SHA-1: 2bdb233dbe4dab89477fa2a3542bc442ac5e546b SHA-256: ef774f8fa502505d8438e8fc085b00ee1c6984187846b54adb81da7200b9ecc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The file's structure and embedded links indicate it is likely part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0v8so4bdng9jqrsr3a00j38kui/69901068772.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///85600446561.pdfIn PDF document text
    • http://th-hl.com///upload/files/doduresovevimo.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/83909713099.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/mafeluzizalupab.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090907583395.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c7d0c3c0---15533509612.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5a4a318d78a84fc03e3c7240a6ae84eb/wibimakabo.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/bevimemexofezodovatibomi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0738788a---tojirewadukixisinugipu.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/fibagepomo.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/35846332081.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/doredajulobenejubegupox.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/solidajozome.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342b2b666a3---xavonogumifixuzibifepa.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/69349817433.pdfIn PDF document text
    • https://olterus.info/contents/files/nubewigiwerilez.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/78588807066.pdfIn PDF document text
    • https://sinarwaja.com/account/files/xagav.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/wonup.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139141d7ba87---30385831512.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1632302579.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/woxoxegitarezipiwarijiju.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b77d77183b---nowebefajuvafejurove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cara+memainkan+ps1+di+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 10584 bytes
SHA-256: f7d950fd6ed681ef84ac3a967e9c0aebab0cc9d8e6757125dff4ca65ebf10baa
font_02_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 17792 bytes
SHA-256: 219d4f69414d30f1f64f3c8a771255e303eaa7d00916f9c9c55aa868f2a13f01

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